Words: etymology: :
literature: history
life: biology
insects: entomology
humans: anthropology

Except for "literature: history" all other options can complete the diagram.

Explanation:

Etymology is a study of the origin and evolution of words. For this reason "words: etymology" means that "words" are studied in "etymology", so in order to complete the diagram, we need to find other words that establish this same relation.

"life: biology" establishes this relationship because biology studies life, so this option could complete the diagram.  Also could complete the diagram the sentences "insects: entomology" and "humans: anthropology", since the entomology is the science that studies the insects; and anthropology is the science that studies humanity, humans.

However, history is not the science that studies literature. For this reason the sentence "literature: history" could not complete the diagram.

what makes a hero is someone who tries and acres and then to save people and it’s not their jobs to save them just a normal person that has no experts of saving people would jump in to action without it twice about doing it. me that’s the defection of a hero!